http get post

package org.crazyit.net;

import java.io.*; 
import java.net.*;
import java.util.*;

/**
 * Description:
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> 
 * <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [email protected]
 * @version  1.0
 */

public class GetPostUtil
{
	/**
	 * 向指定URL发送GET方法的请求
	 * 
	 * @param url
	 *            发送请求的URL
	 * @param params
	 *            请求参数，请求参数应该是name1=value1&name2=value2的形式。
	 * @return URL所代表远程资源的响应
	 */
	public static String sendGet(String url, String params)
	{
		String result = "";
		BufferedReader in = null;
		try
		{
			String urlName = url + "?" + params;
			URL realUrl = new URL(urlName);
			// 打开和URL之间的连接
			URLConnection conn = realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent",
				"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
			// 建立实际的连接
			conn.connect();
			// 获取所有响应头字段
			Map<String, List<String>> map = conn.getHeaderFields();
			// 遍历所有的响应头字段
			for (String key : map.keySet())
			{
				System.out.println(key + "--->" + map.get(key));
			}
			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(
				new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null)
			{
				result += "\n" + line;
			}
		}
		catch (Exception e)
		{
			System.out.println("发送GET请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally
		{
			try
			{
				if (in != null)
				{
					in.close();
				}
			}
			catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
		return result;
	}

	/**
	 * 向指定URL发送POST方法的请求
	 * 
	 * @param url
	 *            发送请求的URL
	 * @param params
	 *            请求参数，请求参数应该是name1=value1&name2=value2的形式。
	 * @return URL所代表远程资源的响应
	 */
	public static String sendPost(String url, String params)
	{
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try
		{
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			URLConnection conn = realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent",
				"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());
			// 发送请求参数
			out.print(params);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(
				new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null)
			{
				result += "\n" + line;
			}
		}
		catch (Exception e)
		{
			System.out.println("发送POST请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输出流、输入流
		finally
		{
			try
			{
				if (out != null)
				{
					out.close();
				}
				if (in != null)
				{
					in.close();
				}
			}
			catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
		return result;
	}
}